Refrigerating apparatus



Y F. L. TARLETON 2.200.222

' RBI-melamine APPARATUS Fiied mi. so, 1936 2 Sheets-Sheet 1 I MENTOR Qiii" 7 1' l a :f I

Ills, ATTORNEYS y 1940- F. L. TARLETON I 2.200.222

REFRI GERATING APPARATUS 4s WI-M ms ATTORNEYS Patented May 7, 1940UNITED STATES 2,200,222 nnmanaarmearmnaros Frederic L. Tarleton, Dayton,Ohio, ass lgnor to General Motors Corporation, Dayton, Ohio, acorporation of Delaware Application December 30, 1936, Serial No.118,329

Claims.

This invention relates to refrigerating apparatus and more particularlyto rotary compressor units of the self-contained type.

An obiect of this invention is to provide an 5 improved unit which willeliminate numerous manufacturing difliculties.

An object of this invention is to provide a main frame to which all ofthe compressor parts are secured, thereby providing a unitary structurewhich may be tested before being enclosed within a housing.

Another object of this invention is to construct a rotary compressorunit in which the final sealing operation does not change the alignmentnor in any other way affect the working parts.

A further object of this invention is to provide a rotary compressorunit which is, very silent and efficient in operation.

Still another object is to provide an improved arrangement for oilingthe moving parts.

Further objects and advantages of the present invention will be apparentfromthe following description, reference being had to the accompanyingdrawings, wherein a preferred form of the present invention is clearlyshown.

In the drawings: Fig. 1 is a cross-sectional view taken on the line 1-4of Fig. 6;

Fig. 2 is a fragmentary cross-sectional'view taken on the line 2-2 ofFig. 6;

Fig. 3 is also a fragmentary cross-sectional view taken on the line 3-3of Fig. 6;

Fig. 4 is a plan view of the muiller plate; Fig; 5 is a bottomview ofthe muiller plate;

. Fig. 6 is a cross-sectional view taken on the line 6-6 of Fig. 1; and

Fig. '7 is a view similar to Fig. 2 showing a modified construction.

Fig. 8 is a fragmentary sectional view taken on line 8-8 of Fig. 7;

.on line 99 of Fig. 5.

In this invention the compressor'unit consists of a main frame structureIt to which all the compressor parts are secured, thereby providing 1central boss I! is provided in the frame structure and serves as thebearing for the compressor and motor rotor shaft It." The compressor isor the rotary type and is adapted to be bolted to the bottom of theframe structure. The motor 5 rotor I 4 is carried by the upper end ofthe shaft divider block Fig. 9 is a fragmentary sectional view taken l3and the eccentric l5 for the-compressor unit is carried by the lower endof the shaft. The eccentric imparts movement to the impeller IS in theusual manner.

As shown in Fig. 1, the impeller engages the 5 under side of frame ID,the wall of the cylindrical number II, the bottom plate It and the usuall9. 'I'hedivider block is biased into engagement with the impeller It bymeans of a pair of springs 20 which abut against the L- 10 shapedbracketil secured to the frame It by means of bolts 22.

Low pressure refrigerant enters the compressor through the conduit 23and leaves through the discharge port 34 which is provided with the 15usual flap valve 25. Secured to the under side of. the plate 18 is amuffler. plate 21. A gasket 28 is interposed between the plate i8 andthe plate 21. This assembly can be tested-as a unit before it .is placedinto a suitable housing. As 0 shown in Fig. 1, the housing comprises apair of cup-shaped members 29 and 30, which are welded together at theirmeeting edges 3|- In assembling the device, the frame member III isforced up into the cup member 29 and is held in 25 place by frictionalengagement. Any other suitable arrangement for holding the frame memberin place may be used without departing from the spirit of the invention.The frame member 'is provided with a plurality of apertures 33,.one 30of which serves as a passage for the electrical leads' 34. In order toreduce the over-all height of the unit, and at the same time provide arigid and silent construction, the end walls have been bulged inwardly.a

It has been discovered that the amount of noise produced by the unit maybe materially reduced'by placing a plate such as 35 over the upper endof the casing. This plate member is out of engagement with the casingexcept at spaced points such as .36 where the plate is secured to thecasing. As shown in Fig. 1, ,the chamber .31 formed between the casingwall and me plate 35 serves as a noise trap. .The presence of the plate35 also'serves to-strengthen the casing. The mufller plate 21 isprovided with a'plurality of chambers 38 to 45 inclusive separated from.I

\ one another by means of the radial web members 41. Communicatingpassages 46 are provided between the various chambers as shown in Figs.0 4 and 9. These passages are placed at an angle so that the fluidleaving one chamber leaves at one level and enters the adjoining chamberat a higher level. .With such an arrangement the oil which is pumpedthrough the compressor along outer edge.

recesses 6| into which the bolts securing the with the refrigerant iscarried along with the refrigerant and .will not have a chance to flowin the reverse direction through the mufller. The compressed refrigerantleaving the discharge port 24 first enters the compartment 38, thenpasses through the first passage 46 into the adjacent chamber 39 andsoon around until'finally it reaches the last chamber 45 from whence it isdischarged into ;theopening Ma which passes through theplatel8,-Eylinder wall I! and frame ID as best shown in Fig. 3. The oil whichis carried along with the refrigerant is permitted to flow through theapertures 33 in the frame In into the lower part of cup-shaped member36.

which serves as an oil chamber. Oil for the moving parts of thecompressor is caused to flow from the oil reservoir in the lower part ofcup through the screen 49, aperture in plate l8 and from there iscarried upwardly between the 20 eccentric l5 and impeller l6 by means ofthe spiral groove 5| in the impeller and is then discharged into thepocket 52' above the eccentric from whence it is caused to flow upwardlyalong the shaft by means of the spiral groove 53 on 5 the shaft. Excessoil is discharged between'the upper end of the boss l2 and the motorrotor I4 and is permitted to return to the oil reservoir through theapertures 33. As best shown in Fig.

2, the mufiler plate 21 is provided with an 'an- 30 nular'ridge 55 onits'under side and is also provided with a vent passage 56. I 'hepurpose of this latter construction is to prevent the gas which isformed by boiling refrigerant out of the oil supply, from entering theoil passage 50. By preventing gaseous refrigerant from circu- 'latingwith;the oil to the moving parts, the compressor operates moreefiiciently. The mufller plate ZI-i's bolted in place by means of boltsnot shown which pass through the holes at its The plate '-I8 is providedwith tap plate 27 in place are threaded.

\ In Figs. 7 and 8, I have shown a modified muiller plateconstructiontogether with a modi- 45 fied oil inlet means. The rest of thecompressor structure is the same as that shown in the other figures. Themuliler plate shown in Fig. 7 is much like the mufller plate 21 shown inFig. 2, except that the annularriclge 55 has been-omitted 50 andthemufiler is thicker. The oil inlet 50a'corresponding to inlet 50 inFig. 2 goes up through the central portion of the plate 66 correspondingto plate l8 and is provided with a pair of oppositely directed channels61 .which lead to the open space 68 between the eccentric l5 and'theplate 66. The inverted funnel-shaped member 69 is placed in the oilinlet so as to pick up the oil from a point adjacent the outer casingmember. With this arrangement a negligible amount m of gas willbe pickedup by the circulating oil. A screen 10 is placed in the mouth of thefunnel as shown in the drawings.

Applicant has provided an, improved motor compressor unit which'is verysimple to manum facture, .is inexpensive and at the same time durable,noiseless and efficient.

While. the form of embodiment of the invention as herein disclosed;constitutes a preferred form, it is to be understood that.other forms70, might be adopted, all coming within the scope of the claims whichfollow. i i

What is claimed 'is as follows:

1. In a motor-compressor unit, the combination ofa cup-shaped casingmember, a frame member telescopicallyengaging said casing mem her andforming a cavity therebetween, a motor stator having a press flt withinsaid frame mem- 5 her and mounted within said cavity, a motor rotorcooperating with saidstator member, a shaft for said rotor, journalmeans for said shaft in tegral with said frame member, a compressorcarried by said frame member on the side op- 10- posite said motorrotor, means whereby said shaft operates said 'compressor a'bulgedportion in said casing member adjacent said rotor, a

plate member substantially closing the open side of said bulged portionand serving to muflle the 15 motor-compressor noises, and a cup-shapedoil reservoir cooperatingwith said casing to hermetically seal saidmotor and compressor as a unit,-'said compressor being substantiallysubmergedin the oil within said reservoir. 20.

2. In combination with a motor-compressor unit, a sheet metal casinghermetically sealing said'motor-compressor unit, an inwardly bulgedportion on said casing member forming an exterior depression in saidcasing, and means co- 2:, operating with said bulged portion and depression forming a sound deadening pocket.

3. In a circulatory compression refrigeration system, a casing, amotor-compressor unit within said casing, and a nuflier into which saidcom 30 I pressor discharges, said mufiler having a plurality of verticalpartitions forming a plurality of horizontally arranged, chambers, saidpartitions having passages leading from a point adjacent the bottom ofone chamber to a higher point'in an 35 adjacent chamber wherebylubricant which 001- lects in the bottom of a chamber is swept by thegas into the next adjacent chamber and is prevented from flowing backwhen the compres sor stops. 1

4. In a motor-compressor unit, the combina-' tion of a cup-shaped sheetmetal casing member, a frame member telescopically engaging said casemember and forming with said casing member a motor cavity, a motorstator having a press fit 45 within said frame member and mounted withinsaid cavity, a motor rotor cooperating with said stator member, a shaftfor said rotor, journal means for said shaft integral with said framemember, a compressor carried by said frame My member on the sideopposite said motor rotor,

means whereby said shaft operates said com- I pressor, a bulged portionin said casing member adjacent said rotor and a plate membersubstantially closing 'the open side of said bulged portion whereby themotor-compressor noises are mufiled.

5. In a hermetically sealed compressor unit, a casing adapted to containa, supply of lubricant,

* a compressor within'said casing having a flap m exhaust valve thereforat its bottom side, an oil' hole for supplying lubricant to the movableparts of saidcompressor located on the bottom'side thereof, amuillerplate seated against said side, said mufller plate having an annularchannel 65 into which said compressor discharges, said channel havingspaced apertured baflies extending substantiallyradiallyfrom the axis ofsaid channel, said muflier plate having means whereby gas whichseparates out from the'lubricant is di- 70 rected away from'the entranceto said oil hole.-

FREDERIC L.. .TARLEION.

